requestId is not populated in metadata if header name is x-amz-request-id

[trivikr]

Describe the bug
requestId is not populated in metadata if header name is x-amz-request-id

In 0.1.0-preview clients, the requestId was populated from x-amz-request-id or x-amz-requestid

aws-sdk-js-v3/packages/response-metadata-extractor/src/index.ts

Lines 19 to 20 in 47f1c36

	requestId:
	httpHeaders[REQUEST_ID_HEADER] || httpHeaders[REQUEST_ID_ALT_HEADER],

In gamma clients, the requestId is only populated from x-amzn-requestid

aws-sdk-js-v3/clients/client-s3/protocols/Aws_restXml.ts

Lines 12829 to 12833 in a377957

	const deserializeMetadata = (output: __HttpResponse): __ResponseMetadata => ({
	httpStatusCode: output.statusCode,
	httpHeaders: output.headers,
	requestId: output.headers["x-amzn-requestid"],
	});

Due to this, the requestId is not populated in metadata if header name is x-amz-request-id

SDK version number

    "@aws-sdk/client-s3-control": "1.0.0-gamma.8",
    "@aws-sdk/client-sts": "1.0.0-gamma.8",

To Reproduce (observed behavior)

Code

const { STS } = require("@aws-sdk/client-sts");
const { S3Control } = require("@aws-sdk/client-s3-control");

(async () => {
  const stsClient = new STS({});
  const s3ControlClient = new S3Control({});

  const { Account } = await stsClient.getCallerIdentity({});
  console.log(await s3ControlClient.listAccessPoints({ AccountId: Account }));
})();

Output

{
  '$metadata': {
    httpStatusCode: 200,
    httpHeaders: {
      'x-amz-id-2': 'r7rFiQubPFSqaW+cXofM2hmAYGqtbg5Jj3ctEWwt1cKzx5eFFW5lwrTa6Qn1rdYEZxrlcEQiD5E=',
      'x-amz-request-id': '2516C4C3BADE55E6',
      date: 'Mon, 14 Sep 2020 16:32:45 GMT',
      'content-length': '72',
      server: 'AmazonS3'
    },
    requestId: undefined,
    attempts: 1,
    totalRetryDelay: 0
  },
  __type: 'ListAccessPointsResult',
  AccessPointList: [],
  NextToken: undefined
}

Expected behavior
requestId is populated from header x-amz-request-id

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